Battery pack



FIG. 1 is a front, top perspective view of a battery pack;

FIG. 2 is a front view thereof;

FIG. 3 is a left view thereof;

FIG. 4 is a right view thereof; and,

FIG. 5 is a back view thereof.

The broken lines shown are included for the purpose of illustrating environmental features and form no part of the claim design. 

The ornamental design for a battery pack, as shown and described. 